JQuery Session problem-Collection of common programming errors

By your example alone, you’re missing a reference to the required files, and you’re not wrapping your jQuery code in script tags. You need to reference not only jquery-source, but jquery-json, and jquery-session as well.

Once you’ve got those in place, you need to place your logic within script tags:

$(function(){
  $.session("foo", "bar");
});

See the following demo for an example: http://www.jaysalvat.com/session/test1.html

Lastly, the language attribute of the script tag is deprecated. You can do away with it, but keep the type attribute.